The fact that many gays want to be spit on and treated less than human. The fact that the torches of his own country's past - Ancient Greece - were lit with the flames of so many socially accepted gays. The fact that he's serving Dumledore - a gay man - realness. The levels of mess keep getting deeper.
I'm from Greece and a lot of LGBT organizations are starting up lawsuits against him. There are even talks about the separation of Church and State. He is also one of the people responsible for covering up the 4 times rape of an 14 year old kid at the common meals he organized to give food to people e.t.c